
var  c = document.forms["formEditor"].elements["jiu_tuid"];
var option;
c.options.length = 0;

<rows>
	option = new Option("${fld:house_name}");
	option.value = '${fld:tuid}';
	c.options.add(option);
</rows>

if(c.options.length > 0){
	c.options[0].selected = true;
}